Frequency attenuation band with low vibration transmission in a finite-size plate strip embedded with 2D acoustic black holes

被引：52

作者：

Ji, Hongli ^{[1
]}

Han, Bing ^{[1
]}

Cheng, Li ^{[2
]}

Inman, Daniel J. ^{[3
]}

Qiu, Jinhao ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, 29 Yudao St, Nanjing 210016, Peoples R China

[2] Hong Kong Polytech Univ, Dept Mech Engn, Hung Hom, Kowloon, Hong Kong 999077, Peoples R China

[3] Univ Michigan, Dept Aerosp Engn, 1320 Beal Ave, Ann Arbor, MI 48109 USA

来源：

MECHANICAL SYSTEMS AND SIGNAL PROCESSING | 2022年 / 163卷

基金：

中国国家自然科学基金;

关键词：

Vibration attenuation band; Acoustic black hole; Local structural resonance; Modal transmission; Modal displacement cancellation; DAMPING FLEXURAL VIBRATIONS; SOUND RADIATION; INDENTATIONS;

D O I：

10.1016/j.ymssp.2021.108149

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Acoustic Black Hole (ABH) structures allowing for wave manipulation and energy focalization have potential applications in broadband structural vibration suppression. In this work, the vibration transmission characteristics of a plate strip embedded with multiple two-dimensional (2D) ABH without additional damping material were investigated. Both the simulation and experimental results show that the investigated structure exhibits attenuation bands with low vibration transmission, and the vibration attenuation phenomenon appears in frequency ranges well below the cut-on frequency of the ABHs. The width and position of the attenuation bands depend on the number of ABHs. A numerical investigation was carried out on the mechanism of the attenuation band generation. The analysis results show dual physical effects: low modal transmission in asymmetrical structures and modal displacement cancellation on the receiving side in both asymmetrical and symmetrical structures. Strong local structural resonances induced by ABHs play an important role in modal transmission reduction, modal displacement cancellation and weak excitation of some modes. The attenuation phenomenon reveals a new ABHspecific feature which enriches the existing knowledge on ABH structures and broadens the design perspective of vibration attenuation through band creation.

引用

页数：14

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